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Sideloading apps on an Android device is often used as a way to bypass restrictions (such as when an app is not available in your region) or to get updates faster. Sometimes it can be the only option when a desired app is not available via the Play Store for one reason or another.
In order to make sure the APKs you are about to install are safe, it would be wise to scan them first to make sure they don’t contain anything harmful. Fortunately, there are tools that let you do that, and we’ve gathered some of them for you here.
Why It’s Recommended to Scan APK FilesOne way to prevent these nasty viruses from infecting your phone is to download APKs from trusted sources only. APK Mirror, for example, is generally accepted by the Android community as being a safe place to get APK files.
Another way you can prevent malware from being loaded onto your phone is by scanning your APK files for viruses before installing. There are a few services that can help you scan an APK. What follows are the best ones you can use.
1. MetadefenderMetadefender allows you to upload an APK file to be scanned by multiple antivirus engines. Files are treated as archives, meaning they will be extracted so that each individual file is scanned, but a scan of the whole unextracted APK file will be performed as well. Users can simply drag and drop their files, and a report will be compiled in a few seconds.
You can access the Metadefender service on your PC, but it’s also possible to scan files directly from your Android phone. While there’s no dedicated mobile app, you can still use it via your handset’s browser.
Metadefender can be used to scan almost anything – including IP addresses, URLs, files and more – not just APKs. So if you ever feel suspicious about something online, this is a great tool to have at your disposal.
2. VirusTotalVirusTotal is another alternative that works similarly to the previous one. It analyzes your APK files and helps to detect all kinds of viruses and malware that may be present. The service is easy to use: just upload your files to make sure they are bug-free. Additionally, you can copy-paste URLs in VirusTotal or use the search function to check IP addresses, domains or file hash.
VirusTotal is also available as a mobile app, although its use is limited to scanning the apps you’ve already installed on your device. It can be downloaded from the Play Store for free.
Additionally, you may want to consider installing an antivirus app on your Android device. If you don’t know where to start, you can check out our list of the best antivirus apps you can get on your phone. This way, you’ll be able to monitor the state of your mobile through regular checkups.
If keeping all your devices safe from the threat of malware is a top priority for you, then perhaps you’d like to find out whether Windows Defender is good enough in 2023 or whether you really do need antivirus software on Linux.
Alexandra Arici
Alexandra is passionate about mobile tech and can be often found fiddling with a smartphone from some obscure company. She kick-started her career in tech journalism in 2013, after working a few years as a middle-school teacher. Constantly driven by curiosity, Alexandra likes to know how things work and to share that knowledge with everyone.
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You're reading How To Scan Apk Files To Check Whether They Have A Virus
How To Check Whether Your Android Phone Is Rooted
Whether you’ve bought a supposedly rooted phone or want to double-check if your rooting procedure was a success, a root-checking tool is useful to have. Just boot it up and check your phone to see whether it’s properly rooted.
One of the best apps to do this with is the aptly-named Root Checker Basic, which automatically lets you know whether your system has root. Here’s how to get and use Root Checker Basic, as well as what upgrading to the premium version provides.
How to Use Root Checker BasicTo use the app, download it from the Google App store and then boot it up. You’ll see a disclaimer pop up asking you for permission to do its work.
Once you’ve given the app its permissions and gone through the brief tutorial, you’ll arrive at the main page. From here, it’s as simple as tapping “Verify Root” on the main screen. The app will now tell you whether you’re rooted. Easy!
Using the Other Features of Root Checker BasicTo stop there, however, would be glossing over the other features this app has. For example, if you scroll down after the initial scan, you’ll see statistics about how hard it is to root your model of phone.
Want more info? Scroll along the top bar until you see “Rankings” and tap it. This gives you more information of how easy it is to root your phone, as well as which models are the easiest to crack open.
If you go to “Root Basics,” you’ll find some helpful tips regarding why people root their phones and how it’s done. This is particularly useful if you’ve bought a secondhand phone and discovered it’s rooted without fully knowing what that means!
What About the Premium Options?The “Advanced Root Checker” option unlocks the root account and superuser app statuses. This will give you a little more insight into your phone, which goes beyond simply telling you whether your phone is rooted. It also gives you more info on the Rankings page as to why each phone is ranked as it is.
The BusyBox checker looks for any applications compatible with BusyBox. If you don’t know what that means, you can safely skip this feature! If you do know what it means, it’s a nice option for keeping track of things.
Getting to the Root of the ProblemIf you’re rooting your phone, or you bought one already rooted, you may want to check whether everything is working properly. With Root Checker Basic, you can quickly and easily check whether your phone is rooted. If that doesn’t satiate your needs, you can grab the premium version and get even more info!
What’s the best part about owning a rooted phone? Let us know below.
Image credit: Rooting my HTC Hero Android Phone
Simon Batt
Simon Batt is a Computer Science graduate with a passion for cybersecurity.
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How To Check Whether A Number Is An Ugly Number Or Not In Java?
A number is said to be an ugly number, if the prime factors of that input number only include 2, 3 and 5.
Maybe some number has some prime factors which have only one factor or two factors but those factors must be one of 2, 3, and 5.
In this article we will see how to check if a number is an Ugly number or not by using Java programming language.
To show you some instances Instance-1Input number is 20.
Let’s check it by using the logic of Ugly number.
Prime factors of 20 = 2, 2, 5So, as you notice here all the prime factors include either of 2, 3 and 5 only.
Hence, 20 is an ugly number.
Instance-2Input number is 30.
Let’s check it by using the logic of Ugly number.
Prime factors of 30 = 2, 3, 5So, as you notice here all the prime factors include either of 2, 3 and 5 only.
Hence, 30 is an ugly number.
Instance-3Input number is 14.
Let’s check it by using the logic of Ugly number.
Prime factors of 14 = 2, 7So, as you notice here 7 is present at one of the prime factors above.
Hence, 14 is not an ugly number.
Algorithm
Step 1 − First we define a function for checking if the input number is a prime number or not.
Step 2 − Collect the input from the user either by static method or by user defined method.
Step 3 − Initialise the loop for finding all the prime factors of input number.
Step 4 − After find the prime factor we run a condition for checking whether the factors have only included 2, 3, and 5 or not.
Step 5 − If the condition is true then we are printing the input number is an ugly number otherwise the input number is not an ugly number.
Multiple ApproachesWe have provided the solution in different approaches.
By Using Static Input Value
By Using User Defined Method
Let’s see the Java program along with its output one by one.
Approach-1: By Using Static Input ValueIn this approach one non−zero, positive integer value will be initialized in the program and then by using the algorithm we can check whether a number is an ugly number or not.
Examplepublic
class
Main
{
public
static
void
main
(
String
args
[
]
)
{
int
inputNumber
=
25
;
boolean
check
=
true
;
for
(
int
i
=
2
;
i
<=
inputNumber
;
i
++
)
{
if
(
i
!=
2
&&
i
!=
3
&&
i
!=
5
)
{
if
(
inputNumber
%
i
==
0
&&
checkPrime
(
i
)
)
{
check
=
false
;
break
;
}
}
}
if
(
check
)
{
System
.
out
.
println
(
inputNumber
+
” is an ugly number”
)
;
}
else
{
System
.
out
.
println
(
inputNumber
+
” is Not an ugly number”
)
;
}
}
static
boolean
checkPrime
(
int
number
)
{
boolean
flag
=
true
;
for
(
int
i
=
2
;
i
<=
number
/
2
;
i
++
)
{
if
(
number
%
i
==
0
)
{
flag
=
false
;
break
;
}
}
return
flag
;
}
}
Output 25 is an ugly number Approach-2: By Using User Defined MethodIn this approach one non−zero, positive integer value will be initialized in the program and then we will call a user defined method by passing this input number as parameter.
Inside the method we will check whether a number is an ugly number or not by using the algorithm.
Examplepublic
class
Main
{
public
static
void
main
(
String
[
]
args
)
{
int
inp
=
56
;
if
(
checkUgly
(
inp
)
)
{
System
.
out
.
println
(
inp
+
” is an ugly number”
)
;
}
else
{
System
.
out
.
println
(
inp
+
” is Not an ugly number”
)
;
}
}
static
boolean
checkPrime
(
int
number
)
{
boolean
flag
=
true
;
for
(
int
i
=
2
;
i
<=
number
/
2
;
i
++
)
{
if
(
number
%
i
==
0
)
{
flag
=
false
;
break
;
}
}
return
flag
;
}
public
static
boolean
checkUgly
(
int
inputNumber
)
{
boolean
check
=
true
;
for
(
int
i
=
2
;
i
<=
inputNumber
;
i
++
)
{
if
(
i
!=
2
&&
i
!=
3
&&
i
!=
5
)
{
if
(
inputNumber
%
i
==
0
&&
checkPrime
(
i
)
)
{
return
false
;
}
}
}
return
true
;
}
}
Output 56 is Not an ugly numberIn this article, we explored how to check a number whether it is an ugly number or not in Java by using different approaches.
Java Program To Check Whether The Given String Is Pangram
In this article, we will understand how to check whether the given string is pangram. A string is a pangram string if it contains all the character of the alphabets ignoring the case of the alphabets.
Below is a demonstration of the same −
Suppose our input is −
Input string: AbcdefghijklmnopqrstuvwxyzThe desired output would be −
Yes, the string is a pangram Algorithm Step 1 - START Step 2 - Declare a string value namely input_string. Step 3 - Define the values. Step 4 - Convert the input string to a character array. Step 5 - Iterate over the character of the array and check if the array contains all the alphabets using charAt(i) - 'a'. If yes, it’s a Pangram string. Step 6 - Display the result Step 7 - Stop Example 1Here, we bind all the operations together under the ‘main’ function.
public class Pangram { static int size = 26; static boolean isLetter(char ch) { if (!Character.isLetter(ch)) return false; return true; } public static void main(String args[]) { String input_string = "Abcdefghijklmnopqrstuvwxyz"; System.out.println("The string is defined as: " +input_string); int string_length = input_string.length(); input_string = input_string.toLowerCase(); boolean[] is_true = new boolean[size]; for (int i = 0; i < string_length; i++) { if (isLetter(input_string.charAt(i))) { int letter = input_string.charAt(i) - 'a'; is_true[letter] = true; } } boolean result; for (int i = 0; i < size; i++) { if (!is_true[i]) result = false; } result = true; if (result) System.out.println("nYes, the string is a pangram"); else System.out.println("nNo, the string is not a pangram"); } } Output The string is defined as: Abcdefghijklmnopqrstuvwxyz Yes, the string is a pangram Example 2Here, we encapsulate the operations into functions exhibiting object-oriented programming.
public class Pangram { static int size = 26; static boolean isLetter(char ch) { if (!Character.isLetter(ch)) return false; return true; } static boolean check_alphabets(String input_string, int string_length) { input_string = input_string.toLowerCase(); boolean[] is_true = new boolean[size]; for (int i = 0; i < string_length; i++) { if (isLetter(input_string.charAt(i))) { int letter = input_string.charAt(i) - 'a'; is_true[letter] = true; } } for (int i = 0; i < size; i++) { if (!is_true[i]) return false; } return true; } public static void main(String args[]) { String input_string = "Abcdefghijklmnopqrstuvwxyz"; System.out.println("The string is defined as: " +input_string); int string_length = input_string.length(); if (check_alphabets(input_string, string_length)) System.out.println("nYes, the string is a pangram"); else System.out.println("nNo, the string is not a pangram"); } } Output The string is defined as: Abcdefghijklmnopqrstuvwxyz Yes, the string is a pangramNew Thunderbolt Hack Exposes Your Files: How To Check If You’Re Safe
New Thunderbolt Hack Exposes Your Files: How To Check If You’re Safe [Updated]
A new Thunderbolt vulnerability could allow hackers to bypass a laptop’s security and access its files – regardless of your password – in a matter of minutes, researchers have announced. Dubbed Thunderspy, the exploit can be used on computers with encrypted drives, though it requires physical access to the notebook and Intel says that recent OSes, including Windows, macOS, and Linux, have been patched against the hack.
It’s not the first time we’ve seen Thunderbolt blamed for security issues. Last year, another exploit known as Thunderclap was discovered, which could allow a malicious USB-C or DisplayPort accessory to compromise a computer.
The exploit that Thunderspy relies upon was identified by Björn Ruytenberg, a researcher from the Eindhoven University of Technology. “Thunderspy is stealth, meaning that you cannot find any traces of the attack,” he explains. “It does not require your involvement, i.e., there is no phishing link or malicious piece of hardware that the attacker tricks you into using. Thunderspy works even if you follow best security practices by locking or suspending your computer when leaving briefly, and if your system administrator has set up the device with Secure Boot, strong BIOS and operating system account passwords, and enabled full disk encryption.”
It’s not quite as simple as plugging in a Thunderbolt 3 device and instantly being granted access, mind. It works by creating arbitrary Thunderbolt device identities – which would usually be generated for authentic accessories when they’re connected – and cloning user-authorized Thunderbolt devices. To do that, a hacker would need physically access to the target PC, as well as time and opportunity to actually open it up and attach a specially-constructed piece of hardware.
Still, it’s enough to suggest that all Thunderbolt-equipped systems shipped between 2011 and 2023 are vulnerable, Ruytenberg says. He’s released a tool known as Spycheck to identify whether systems are open to being compromised.
Whether your PC, Mac, or Linux box is will depend on what version of its software it’s running. In a response from Intel, the chip-maker points to changes made to OSes last year.
“In 2023, major operating systems implemented Kernel Direct Memory Access (DMA) protection to mitigate against attacks such as these,” Intel’s Jerry Bryant, Director of Communications for Product Assurance and Security, writes. “This includes Windows (Windows 10 1803 RS4 and later), Linux (kernel 5.x and later), and MacOS (MacOS 10.12.4 and later). The researchers did not demonstrate successful DMA attacks against systems with these mitigations enabled.”
For Windows 10 systems purchased before 2023, Ruytenberg says, there’s no fix to avoid the Thunderspy exploit. Those purchased in or after 2023 may have the Kernal DMA support that Intel discusses. The same applies to Linux machines.
As for macOS, according to an Apple statement only certain aspects of Thunderspy apply. “Some of the hardware security features you outlined are only available when users run macOS,” the company told Ruytenberg. “If users are concerned about any of the issues in your paper, we recommend that they use macOS.”
[Update: An Apple spokesperson pointed us to a presentation by Ivan Krstić, Head of Security Engineering and Architecture, in which he specifically discusses the work the company did to prevent these malicious DMA attacks. “Intel introduced a technology called VT-d, which is a way to initialize an input output memory management unit to manage those kinds of DMA transfers,” Krstić explains in the talk, from around the 3 minute mark. “We have used this technology to protect the kernel since OS X Mountain Lion in 2012.”
How To Determine Whether A Website Is Legit And Safe To Use
As the Internet continues to grow and expand worldwide, the dangers of hacks and attacks also continue to increase. One popular way malicious actors steal data from people is through fake websites. Millions of people have fallen prey to such bad actors.
How do you protect yourself against such attacks? Let’s take a look at that below and explore the risks of using fake websites and how to identify them.
What Are the Risks of Fake Websites?Visiting fraudulent websites carries some inherent dangers.
1. Hacking 2. PhishingAn excellent example is spam emails which attempt to persuade you to provide them with login or credit card information. Once they have your credit card info, they can commit credit fraud or steal your money.
3. Computer Malware 4. Identity TheftFilling out your information in forms on a fraudulent website exposes you to a massive risk of identity theft. Attackers will often use this information to impersonate you, steal your data and/or money or commit other crimes in your name.
How to Identify Fake WebsitesUnlike what you’d expect, it’s pretty easy to identify a fraudulent website if you pay attention. Here are some things to look out for:
1. Poor Design and ThemesExamine the website layout. Online scammers don’t often invest in design, as it costs money they’d rather not spend. Usually, they assemble sketchy sites in minimal time.
Most elements on this website won’t work. For example, sliders may fail to move across the homepage. Images may fail to load, and embedded videos don’t play. The overall user interface may also look outdated. Essential elements will make the website responsive.
You can also look out for company brand colors, something hackers often get wrong.
2. Grammatical ErrorsUnless malicious actors invest in the scam attempt, they often make mistakes with the language on the website. One thing to look out for is terrible grammar.
3. Emotional LanguageObserve the mood a website uses to convey information. Scammers know how to appeal to your emotions and induce fear, urgency, or outrage to get you to take the desired action. They use manipulative language to extort you, which most legitimate websites won’t do.
4. Lack of Support PagesIn a bid to stay as mysterious as possible, most fake websites lack essential pages you’d find in legitimate websites. Hackers attempt to remain anonymous by burying contact and support pages deep in their fraudulent websites.
If the pages exist, they’ll have bogus contact information. Email addresses will have strange extensions, like .xyz, .site, or .contact, and website phone numbers will have foreign country codes or won’t go through.
Is the Website Safe to Use?As a general principle, learning a little about identifying safe websites will protect you from many fake websites.
1. Check for HTTPS and SSL certificatesThe first thing you should check for on a website is a secure transfer protocol, often displayed as “HTTPS://” just before a website’s domain. HTTPS is a secure extension of HTTP. Websites using only HTTP aren’t always secure, although not all are scam websites.
Using HTTPS means the website uses an SSL certificate or Secured Socket Layer. An SSL creates end-to-end encryption between the server computer and your PC, ensuring all your communications are secure and clocking malware and attacks.
2. Use a Website Reputation CheckerAnother quick way to check for the legitimacy of a website is to use a website reputation checker. An excellent example of a reputation checker is Google Safe Browsing.
Another unique way to inspect your website for safety is VirusTotal. VirusTotal uses over 70 antivirus scanners to test the website for malicious code or malware. In much the same way as the Google Safe Browsing tool, you can determine how safe a domain is using this tool.
3. Double-Check the Domain NameBefore opening a website in your browser, double-check the URL to ensure it’s correct. All it takes is a hover over the website link on your Chrome or Firefox browser.
You should see the full URL and its path at the bottom left of your browser. Pay attention to the spelling in the URL. Sometimes cybercriminals clone the original website and use a link that closely resembles the high-profile website. Unless you’re keen, you may fall into a scam.
4. Look For a Privacy Policy PageThe Privacy policy page paints how the website collects, uses, and protects your information. A privacy policy is a legal requirement in some countries and territories (like the EU). Take some time to go through the website’s privacy policy before sharing personal information on it.
It’s now global best practice to have a privacy policy, and a website without a one is a massive red flag.
5. Test the “Trust” BadgesTrust Badges are authentication tokens from third-party sources that attest to the legitimacy of your website. These badges are often on the website’s footer section, check-out, login, and home pages.
6. Use the Safety Tools in Your BrowserMost web browsers come with security features that secure you as a user, including Opera’s built-in VPN. These features can also help identify and warn you of potentially unsecured websites.
7. Contact the Website OwnersA legit website will always have an email address, physical address, social media accounts, and phone number. If the website has provided those details, try to contact the owners.
If the owners have no knowledge of the website, it should be a sign it’s a malicious website. Other red flags to look out for are dropped calls, non-existent addresses, bounced emails, and too many redirects.
Frequently Asked Questions 1. Can you get hacked by just visiting a website? 2. What information do scammers steal?Scammers will steal your personal bank account number login details like passwords, social security numbers, physical addresses, and phone numbers.
Hackers can sell this information for money on the dark web or clean out your checking and savings accounts. They can also use ransomware to lock your files and extort you.
3. Can a link hack my phone?Like a PC, opening an infected website on your phone can expose you to similar attacks. Beyond that, connecting your smartphone to a public Wi-Fi network can also expose you to possible brute force attacks, and hackers can similarly access your personal details.
Image credit: Unsplash
Ian Derrick
Ian is a technology writer with over 11 years of experience with Windows. He also has experience working in Data Analysis, Android, and Computer Hardware. He writes for MakeTechEasier on a wide range of tech topics, including Windows, Android, VPNs, Hardware, and Software tools and Reviews, and How-tos.
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